flixweedPronunciation: /ˈflɪkswiːd/Definition of flixweed noun [mass noun] a Eurasian plant with small yellow flowers and finely divided leaves, which was formerly thought to cure dysentery. Descurainia sophia, family Cruciferae Origin: late 16th century: from obsolete flix (variant of flux) + weedflixweed in other Oxford dictionaries Definition of flixweed in the US English dictionary